云南维西县滑坡地质灾害形成机理及成灾模式

Formation and Model of Geological Landslide Hazards in Weixi County,Yunnan Province

云南省是我国滑坡地质灾害频发地区之一,以滇西北维西县为例,总结归纳滑坡形成机理和成灾模式,对推进西南地区滑坡治理有一定的实用与指导意义。维西县是云南省2020年度重点区域地质灾害精细化调查与风险评价的县份之一,共发育有384处滑坡,其形成机理主要为风化碎屑流型、潜蚀陷落型、切蚀-加载型,每个滑坡的形成可能是几种形成机理共同作用的结果。县域滑坡主要成灾模式有蠕滑-拉裂成灾模式、随动成灾模式、高速碎屑流成灾模式和滑坡-泥石流链式成灾模式。分析滑坡的形成机理和成灾模式,可为县域及类似地区滑坡地质灾害防灾减灾提供指导。

Yunnan Province is one of the areas where landslide hazards occur frequently in our country.This paper presents a case history of landslide investigation in Weixi County in the northwest of Yunnan Province.It summarizes the formation mechanism and hazard model of landslides,which has a practical and guiding significance for promoting the landslide control in the southwest of our country.Weixi County is one of the counties in Yunnan Province for the refined investigation and the risk assessment of the geological hazards in key areas in 2020.A total of 384 landslides have been identified,and there are mainly weathering debris flow type,subsurface erosion and subsidence type,and shear erosion loading type for the formation mechanisms of landslides.The formation of a landslide may be the result of several formation mechanisms.Taking into the hazard bearing body and the landslide movement account,the main hazard models of the landslides in Weixi county include the creep rupture,the follow-up,the high-speed debris flow and the landslide debris flow chain hazard models.Analyzing the formation mechanism and the hazard models of landslides can provide guidance for the prevention and reduction of the geological landslide hazards in the county and similar areas.